Headphone



FIG. 1 is a perspective view of a headphone showing the new design;

FIG. 2 is a perspective view thereof, in a folded configuration; and,

FIG. 3 is another perspective view thereof.

The broken lines are directed to environment, are for illustrative purposes only, and form no part of the claimed design. The line shading is intended to depict contours, and does not connote the character of surfaces such as any specific material, surface treatment, or texture. 

CLAIM The ornamental design for a headphone, as shown and described. 